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Application of fractal theory to top-coal caving

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  • Xie, H.
  • Zhou, H.W.

Abstract

The experiences of underground coal mining in China show that coal in a thick hard coal seam with a hard roof, the so-called “double hard coal seam”, is difficult to be excavated by top-coal caving technique. In order to solve the problem, a top-coal weakening technique is proposed in this paper. In the present study, fractal geometry provides a new description of the fracture mechanism for blasting. By means of theoretical analysis of the relationship between the fractal dimension of blasting fragments and the dynamite specific energy, a mechanical model for describing the size distribution of top-coal and the dissipation of blasting energy is proposed. The theoretical results are in agreement with laboratory and in situ test results. Moreover, it is shown that the fractal dimension of coal fragments can be used as an index for optimizing the blasting parameters for a top-coal weakening technique.

Suggested Citation

  • Xie, H. & Zhou, H.W., 2008. "Application of fractal theory to top-coal caving," Chaos, Solitons & Fractals, Elsevier, vol. 36(4), pages 797-807.
    • Handle: RePEc:eee:chsofr:v:36:y:2008:i:4:p:797-807
    DOI: 10.1016/j.chaos.2006.07.024
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    References listed on IDEAS

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    1. He, Chuanjiang & Xu, Xiaozeng & Yang, Jing, 2006. "Fast fractal image encoding using one-norm of normalised block," Chaos, Solitons & Fractals, Elsevier, vol. 27(5), pages 1178-1186.
    2. Ziaei, Ali Naghi & Keshavarzi, Ali Reza & Homayoun, Emdad, 2005. "Fractal scaling and simulation of velocity components and turbulent shear stress in open channel flow," Chaos, Solitons & Fractals, Elsevier, vol. 24(4), pages 1031-1045.
    3. Gnitecki, January & Moussavi, Zahra, 2005. "The fractality of lung sounds: A comparison of three waveform fractal dimension algorithms," Chaos, Solitons & Fractals, Elsevier, vol. 26(4), pages 1065-1072.
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    Cited by:

    1. Zhu Li & Jialin Xu & Shengchao Yu & Jinfeng Ju & Jingmin Xu, 2018. "Mechanism and Prevention of a Chock Support Failure in the Longwall Top-Coal Caving Faces: A Case Study in Datong Coalfield, China," Energies, MDPI, vol. 11(2), pages 1-17, January.

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